JPS60231069A - Pressure operation type seal ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure actuated seal ring as described in the preamble of claim 1, for example as disclosed in US Pat. No. 4,165,079.

Conventional pressure actuated seal rings have smooth inner and outer cylindrical surfaces. During operation of this sealing ring, fluid passes through the outer cylindrical surface and H also flows through the outer cylindrical surface. In short, the inner cylindrical surface provides a seal in the groove Ji and prevents direct outward pressure from building up on the inner surface.

Such seal rings result in relatively high fluid leakage of the hydraulic control system.

The present invention aims to solve this deficiency.

To this end, the pressure-activated sealing ring according to the invention is characterized by the features set out in the characterizing part of claim 1.

The reel ring reduces leakage by being pushed into sealing engagement with the sealing surface by the action of fluid pressure.

For example, if a pressure actuated seal ring is provided with a corrugated inner surface, the seal ring according to the present invention will initially permit fluid leakage across the outer cylindrical surface to a certain extent. However, this leakage is always accompanied by a pressure drop. Since the inner surface of the seal ring is corrugated, the static pressure of the fluid acts on this inner surface to overcome the pressure acting on the outer surface, so that the seal ring is in sealing engagement at the outer side. Press.

In this way, the corrugated portion provided on one surface of the seal ring, for example, the inner surface, prevents the sealing action on that sealing surface and allows the pressurized fluid to act thereon, so that the sealing ring performs the sealing action on the other sealing surface. move it.

Hereinafter, the present invention will be explained by way of examples with reference to the attached references. Note that in these drawings, it should be understood that like symbols indicate the same or corresponding parts.

Referring to FIG. 1, a portion of the power transmission device shown herein includes a working fluid flow circuit. The mechanism shown in FIG. 1 includes a rotating shaft member 10 having a centrally located fluid passageway 12 connected to receive fluid from a conventional fluid pressure control mechanism 14. The shaft 10 has a pair of annular projections 16, 18 which cooperate with each other to form an annular working fluid. Yadebe 16
．． 18 is formed as a grooved land, each having its own sealing ring 22,24.

The working fluid chamber 20 includes a radial passage 26 formed in the shaft 10.
It is connected to passage 12 by.

Seal rings 22 , 24 are placed in sealing abutting relationship with housing assembly 28 , which includes sleeve 30 and clutch housing support 32 . Sleeve 30 has at least one passageway 20;
This passage connects the annular base 20 and the clutch housing support 3.
The pressure chambers 36 formed in the pressure chambers 2 and 3 communicate with each other.

A pair of annular grooves 38 are provided in the clutch housing support 32.
．． 40 are formed and a pressure actuated seal ring 42, 44 is disposed within each of these grooves. A passage 46 is also formed in the clutch housing support 32.
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G fs L Knee-Il, II ”J H42,
44 and an annular fluid tube 48 disposed between them.

Drivenly connected to shaft 10 and rotatably disposed about support 32 is a clutch housing 50 with a pressure actuated clutch piston 52 slidably disposed within the clutch housing. Since the assembly, structure, and operation of the latch piston have been described above, we believe that no further explanation is necessary.

The clutch housing 10 has an inner bore 51 which, in cooperation with seal rings 42 and 44, surrounds an annular fluid 48. clutch housing 50
A fluid passageway 54 is formed in the recess, which fluid passageway 54 communicates with the annular base 48 and the clutch control chamber 56 .

When it is desired to actuate the piston 52, the clutch control chamber 56 is separately pressurized by pumping pressurized fluid from the control mechanism 14 into the passageway 12.

In order to ensure efficient and effective operation of clutch piston 52, it is desirable to maintain minimal leakage within the actuating fluid flow path. Therefore, the sealing ring 44 , 42 must be pressed into sealing abutment with the outer cylindrical surface 58 and the inner cylindrical sealing surface 60 of the inner bore 51 of the clutch housing 50 . Such a sealed arrangement is shown in FIG. When such a sealing encounter occurs, fluid pressure within the annular chamber 48 acts on the inner cylindrical surface 62 of the seal ring 44 to negotiate a seal.

In conventional seal rings, such as seal ring 64 shown in FIG. 2, an inner cylindrical surface 66 can seal against an annular cylindrical surface 68 formed in groove 40. When this occurs, fluid within chamber 48 flows axially outwardly across the outer cylindrical surface of seal ring 64 of the flow bed, exerting pressure thereon which forces conventional seal ring 64 into an inner position. will be retained. The resulting fluid leakage is detrimental to the performance and consistency of the clutch actuation system.

In contrast, as seen in FIG. 3, the present invention allows the seal 44 to be pushed outwardly into the desired sealing engagement. This is provided with a sealing ring 44, whose inner surface 6
By forming a corrugated portion or a scalloped portion γ2 on 2, the distance can be extended. A cylindrical surface 74 is provided between the scalloped portions 72.
are provided such that these cylindrical surfaces 74 abut the inner surface 68 of the groove 40 if the seal ring is compressed within the groove 40 for any reason. However, when the annular fluid chamber 48 is pressurized, fluid pressure is directed toward the scallops or corrugations 72 and acts radially outwardly on the inner surface 62 of the seal ring 44 .

Since the pressure acting on this inner surface is static pressure, the annular chamber 4
8, while as the fluid flows across the outer surface 58, due to its dynamic nature, the pressure acting on the outer surface 58 will decrease.

As usual, the static pressure will be at a higher level than the dynamic pressure, and the outward force acting on the seal ring 44 will be greater than the inward force, thereby causing the seal ring 44 and the surface 60 of the latch housing 50 to Press to seal the floor. This sealing engagement occurs substantially simultaneously with the initial pressure increase in the annular chamber 48 before any increase in the pressure acting on the clutch piston 52 occurs. Therefore, the piston movement is constant and the hydraulic efficiency of the circuit is improved.

Although the above description of this preferred embodiment describes a pressure actuated seal outwardly from the inner radial line, a corrugation forming an interruption on one side is formed on the ultraviolet outer side and provides a sealing action on the radially inner surface. You can also make them do it. In general, the seal arrangement described above may also be utilized in a linear displacement structure, such as a piston-cylinder arrangement.

[Brief explanation of drawings]

Figure 1 is a fragmentary longitudinal sectional view of a portion of a hydraulic fluid system. FIG. 2 is an enlarged view of a part of FIG. 1 and shows a conventional seal ring. FIG. 3 is an enlarged view of the same portion as in FIG. 1, showing a seal ring according to the present invention. FIG. 4 is a side view of a seal ring according to the present invention. [Explanation of symbols of main parts] 32.50...Pair of components, 40...Seal groove, 44...Seal ring, 51...Inner diameter hole, 60...
... Seal surface, 62.58 ... Cylindrical inner and outer surfaces, 72.
...Waveform part.

Claims (1)

[Claims] 1. In a fluid pressure system, one side has an inner diameter hole,
A pressure actuated seal ring having an inner and outer cylindrical surface for use in a seal groove in one of a pair of relatively movable components, the other having a shaft, the pressure actuated seal ring having radial surface and one of its cylindrical surfaces, whereby the sealing ring is pressed radially against one of the components and axially against one side wall surface of the groove. In a pressure-operated seal ring that is pressed by a pressure-operated seal ring, a plurality of corrugated portions are formed on one of the cylindrical surfaces, and when this seal ring is subjected to cutting edge pressure, the fluid pressure as described above is applied to the pressure-operated seal ring. A pressure-operated seal ring characterized in that it acts on one cylindrical surface and is capable of sealing against an element of the seal ring. 2. The pressure-operated seal ring according to claim 1, wherein the plurality of corrugated portions are formed on the radially inner surface of the cylindrical shape, and when the seal ring is compressed radially inward, the fluid applying pressure to the radially inner surface;
A pressure-operated seal ring characterized in that the seal ring protrudes radially outward to seal against the seal surface of an inner diameter hole.